Experiments reveal the origin of interfacial Dzyaloshinskii–Moriya interaction in magnetic heterostructures, indicating significant effects for applications.
Recent results show remarkable interfacial-Dzyaloshinskii-Moriya interaction (i-DMI) effect in magnetic heterostructures composed of relatively thick Fe thin films ( 1\, nm ≫ 1 nm ). To investigate its origin, we present a thorough magnetic characterization of the SiO 2 / 57 Fe(t)/Au and SiO 2 /Pt/ 57 Fe(t)/Au heterostructures (t = 1.6–2.2 nm). An i-DMI constant DₛPt=0.43± 0.02 \ mJ/m² D s Pt = 0.43 ± 0.02 mJ / m 2 is extracted for the Pt/Fe/Au system, as probed by wavevector-resolved Brillouin light scattering spectroscopy. Ferromagnetic resonance and conversion electron Mössbauer spectroscopy provide evidence that significant surface anisotropy is present in Pt/Fe/Au and an interfacial Fe fraction (~ 18%) exhibits tilted magnetization (~ 25° out of plane) and enhanced hyperfine field, correlating with the stronger i-DMI. Graphic Abstract
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Longo et al. (2026) studied this question.
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